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Description
These two cyclotron chambers in this photograph were built by N. E. Edfelson, under the direction of Prof. Earnest O. Lawrence, in the spring of 1930 to test the principle of cyclotron-magnetic resonance acceleration. These two chambers fitted between the 4-inch diameter poles of a spectroscopist's magnet. Rather diffuse resonance phenomena were observed, especially in the instrument at left, which could be ascribed to hydrogen and other ions of various charge mass ratios undoubtedly present. The chamber on the left was made of hardly more than odd pieces of window pane, scraps of brass and a general overcoat of wax. The wire on the left connected to a probe-like electrode on which resonance characteristics might be observed. The apparatus on the right was a flattened glass flask slvered on the inside. This plating was removed along a diametrical side tube. Again resonance phenomena were sought through the lead to the left. The chambers were constructed and tested immediately after the University of California convened in January 1930. The principle was formally announced before the September 1930 meeting of the National Academy of Sciences in Southern California. [photo and caption from: Information Division, Lawrence Radiation Laboratory, University of California, Berkeley, Morgue 1944-27 (P1)
Type
image
Identifier
202DC7E6-0204-4982-9669-227362985348 2003-33-230
Subject
Cyclotrons Edfelson, N. E Lawrence, Ernest Orlando
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